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It's really fucking annoying, because the equation in question was getting the length of a vector, and the second notation is apparently some kind of general case that no one but a cunt would ever use, and has nothing to do with getting the length of a vector in computer games, so why the fuck would someone put it in a math book for people trying to write computer games arghhhh
People who did higher maths are probably laughing at me now.
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